(maint) - Bump litmus gem to ~> 1.1

Author: jordanbreen28

Gemfile

@@ -37,7 +37,7 @@ group :development do
   gem "github_changelog_generator", '~> 1.15.0', require: false
 end
 group :system_tests do
-  gem "puppet_litmus", '~> 1.0', require: false, platforms: [:ruby, :x64_mingw]
+  gem "puppet_litmus", '~> 1.1', require: false, platforms: [:ruby, :x64_mingw]
   gem "serverspec", '~> 2.41',   require: false
 end